iOS (Swift) Online Test

About the test:

The iOS Online Test uses scenario-based MCQs to evaluate candidates on their proficiency in developing iOS mobile applications, including their knowledge of Swift programming language, UIKit, Core Data, Auto Layout, memory management, and debugging. The test includes a coding question to evaluate hands-on programming skills and aims to assess a candidate's ability to design and develop iOS mobile applications that adhere to industry best practices and standards.

Covered skills:

Objective-C
Error handling and debugging
File Structure

Swift
Views and controllers

See all covered skills

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9 reasons why

Adaface iOS (Swift) Online Test is the most accurate way to shortlist iOS Developers

Reason #1

Tests for on-the-job skills

iOS (Swift) online assessment test is designed and validated by industry experts to help tech recruiters and hiring managers assess iOS programming skills of the candidate. Top tech companies are using our iOS programming test to reduce candidate screening time by 85%.

The test ensures candidates have following traits:

Ability to write reusable iOS code
Ability to design and build advanced applications for the iOS platform
Proficiency in Swift/ Objective C with a good knowledge of its ecosystems
Experience of working with RESTful APIs to connect to back-end services
Top notch UI design skills
Experience integrating multiple data sources and databases

Reason #2

No trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface ->

Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

These are just a small sample from our library of 10,000+ questions. The actual questions on this iOS Online Test will be non-googleable.

🧐 Question
Medium Completion Handlers Views Animations	Solve
Consider the following iOS (Swift) code snippet: What will happen when this view controller appears? A) The squareView will move 100 points to the right instantly and then change its background color to blue. B) The squareView will not move, and its background color will not change. C) The squareView will change its background color to blue instantly and then move 100 points to the right over 1 second. D) The squareView will move 100 points to the right and change its background color to blue simultaneously over 1 second. E) The squareView will move 100 points to the right over 1 second, and the background color will change to blue after 1 second.
Medium UI Responder Chain UI Views Interaction.	Solve
Consider the following iOS (Swift) code snippet: When the user taps on the CustomButton, what will be the output? Note that UIButton is a subclass of UIControl by default. A) Only "CustomButton touchesBegan" will be printed. B) "CustomButton touchesBegan" and "CustomView touchesBegan" will be printed. C) "CustomButton touchesBegan", "CustomView touchesBegan", and "ViewController touchesBegan" will be printed. D) "CustomButton touchesBegan" and "ViewController touchesBegan" will be printed. E) No output will be printed.
Medium ViewController Buggy Code	Solve
Here's two different ways to write the same code in iOS (Swift): Which of the following statements are correct?
Medium Data Provider DispatchQueue Closures Asychronous operations.	Solve
Consider the following code snippet: What will be printed after the code execution?
Medium Property Observers OOPs	Solve
Consider the following Swift code snippet: What does the code print after execution? A) 800, -100, 80, 80 B) 800, 800, 80, 72 C) 1000, 800, 100, 72 D) 800, 800, 80, 80 E) 800, 0, 80, 80
Medium Class Destructor OOPs	Solve
What does the following Swift code output?
Easy Defer blocks	Solve
What does the following Swift code output?
Easy Lazy Variables	Solve
What does the following Swift code output?
Easy Registration Queue Logic	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
Medium Longest Road logic hashmaps	Solve
A startup company E-Motors is building driverless automated cars. The car contains a sensor that checks the road quality for the next N meters to decide the optimal speed at which the cars should move. We are given recorded data by the sensor in the form of an array, where each element of the array is the rating given to 1 meter of the road in sequence. The rating given by the sensor is from 1 to 100, where 100 represents the road with the best condition, and any rating above 60 is optimal. Find the longest stretch of road in meters that is categorized as optimal by the sensor. The input is an array of "strings" which needs to be converted from string to integer/number inside the function.
Medium Visitors Count Strings	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill
	Medium Completion Handlers Views Animations	2 mins iOS	Solve
Consider the following iOS (Swift) code snippet: What will happen when this view controller appears? A) The squareView will move 100 points to the right instantly and then change its background color to blue. B) The squareView will not move, and its background color will not change. C) The squareView will change its background color to blue instantly and then move 100 points to the right over 1 second. D) The squareView will move 100 points to the right and change its background color to blue simultaneously over 1 second. E) The squareView will move 100 points to the right over 1 second, and the background color will change to blue after 1 second.
	Medium UI Responder Chain UI Views Interaction.	3 mins iOS	Solve
Consider the following iOS (Swift) code snippet: When the user taps on the CustomButton, what will be the output? Note that UIButton is a subclass of UIControl by default. A) Only "CustomButton touchesBegan" will be printed. B) "CustomButton touchesBegan" and "CustomView touchesBegan" will be printed. C) "CustomButton touchesBegan", "CustomView touchesBegan", and "ViewController touchesBegan" will be printed. D) "CustomButton touchesBegan" and "ViewController touchesBegan" will be printed. E) No output will be printed.
	Medium ViewController Buggy Code	3 mins iOS	Solve
Here's two different ways to write the same code in iOS (Swift): Which of the following statements are correct?
	Medium Data Provider DispatchQueue Closures Asychronous operations.	3 mins Swift	Solve
Consider the following code snippet: What will be printed after the code execution?
	Medium Property Observers OOPs	2 mins Swift	Solve
Consider the following Swift code snippet: What does the code print after execution? A) 800, -100, 80, 80 B) 800, 800, 80, 72 C) 1000, 800, 100, 72 D) 800, 800, 80, 80 E) 800, 0, 80, 80
	Medium Class Destructor OOPs	2 mins Swift	Solve
What does the following Swift code output?
	Easy Defer blocks	2 mins Swift	Solve
What does the following Swift code output?
	Easy Lazy Variables	2 mins Swift	Solve
What does the following Swift code output?
	Easy Registration Queue Logic	30 mins Coding	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Medium Longest Road logic hashmaps	25 mins Coding	Solve
A startup company E-Motors is building driverless automated cars. The car contains a sensor that checks the road quality for the next N meters to decide the optimal speed at which the cars should move. We are given recorded data by the sensor in the form of an array, where each element of the array is the rating given to 1 meter of the road in sequence. The rating given by the sensor is from 1 to 100, where 100 represents the road with the best condition, and any rating above 60 is optimal. Find the longest stretch of road in meters that is categorized as optimal by the sensor. The input is an array of "strings" which needs to be converted from string to integer/number inside the function.
	Medium Visitors Count Strings	30 mins Coding	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Completion Handlers Views Animations	iOS	Medium	2 mins	Solve
Consider the following iOS (Swift) code snippet: What will happen when this view controller appears? A) The squareView will move 100 points to the right instantly and then change its background color to blue. B) The squareView will not move, and its background color will not change. C) The squareView will change its background color to blue instantly and then move 100 points to the right over 1 second. D) The squareView will move 100 points to the right and change its background color to blue simultaneously over 1 second. E) The squareView will move 100 points to the right over 1 second, and the background color will change to blue after 1 second.
	UI Responder Chain UI Views Interaction.	iOS	Medium	3 mins	Solve
Consider the following iOS (Swift) code snippet: When the user taps on the CustomButton, what will be the output? Note that UIButton is a subclass of UIControl by default. A) Only "CustomButton touchesBegan" will be printed. B) "CustomButton touchesBegan" and "CustomView touchesBegan" will be printed. C) "CustomButton touchesBegan", "CustomView touchesBegan", and "ViewController touchesBegan" will be printed. D) "CustomButton touchesBegan" and "ViewController touchesBegan" will be printed. E) No output will be printed.
	ViewController Buggy Code	iOS	Medium	3 mins	Solve
Here's two different ways to write the same code in iOS (Swift): Which of the following statements are correct?
	Data Provider DispatchQueue Closures Asychronous operations.	Swift	Medium	3 mins	Solve
Consider the following code snippet: What will be printed after the code execution?
	Property Observers OOPs	Swift	Medium	2 mins	Solve
Consider the following Swift code snippet: What does the code print after execution? A) 800, -100, 80, 80 B) 800, 800, 80, 72 C) 1000, 800, 100, 72 D) 800, 800, 80, 80 E) 800, 0, 80, 80
	Class Destructor OOPs	Swift	Medium	2 mins	Solve
What does the following Swift code output?
	Defer blocks	Swift	Easy	2 mins	Solve
What does the following Swift code output?
	Lazy Variables	Swift	Easy	2 mins	Solve
What does the following Swift code output?
	Registration Queue Logic	Coding	Easy	30 mins	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Longest Road logic hashmaps	Coding	Medium	25 mins	Solve
A startup company E-Motors is building driverless automated cars. The car contains a sensor that checks the road quality for the next N meters to decide the optimal speed at which the cars should move. We are given recorded data by the sensor in the form of an array, where each element of the array is the rating given to 1 meter of the road in sequence. The rating given by the sensor is from 1 to 100, where 100 represents the road with the best condition, and any rating above 60 is optimal. Find the longest stretch of road in meters that is categorized as optimal by the sensor. The input is an array of "strings" which needs to be converted from string to integer/number inside the function.
	Visitors Count Strings	Coding	Medium	30 mins	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

Reason #4

1200+ customers in 75 countries

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

Brandon Lee, Head of People, Love, Bonito

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment iOS Online Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the iOS Online Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

Reason #7

Detailed scorecards & comparative results

Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

Reason #9

Advanced Proctoring

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About iOS (Swift) Developer Job Roles

iOS is a mobile operating system created and developed by Apple Inc. exclusively for its hardware. It is the operating system that presently powers many of the company's mobile devices, including the iPhone, and iPod Touch; it also powered the iPad prior to the introduction of iPadOS in 2019.

An iOS developer builds, tests, and refines applications for mobile devices that use Apple's iOS operating system that are consistent with the goals and standards of their company or client. iOS developers most commonly program in Swift and Objective-C. Swift is a general-purpose compiled coding language released by Apple in 2014. It offers better type safety, security, and performance than Objective-C.

Typical responsibilities of an iOS Developer include:

Designing and building mobile applications for Apple’s iOS platform
Ensuring quality and performance of application to specifications
Collaborating with a team to define, design, and ship new features
Continuously discover, evaluate, and implement new technologies to maximize development efficiency
Fixing application bugs before final release
Publishing application on App Store
Work on bug fixing and improving application performance

The test is designed to screen candidates for roles like:

Junior iOS developer - Swift
Intermediate iOS developer - Swift
Senior iOS developer - Swift
Junior iOS developer - Objective C
Intermediate iOS developer - Objective C
Senior iOS developer - Objective C
Mobile developer
Swift developer
Objective C developer

What roles can I use the iOS Online Test for?

iOS Developer
Swift Developer
Objective C Developer
Mobile Developer

What topics are covered in the iOS (Swift) Online Test?

Swift

Error handling and debugging

Views and controllers

File Structure

Conditionals

For Loops

Object-Oriented Programming

Variables

Functions

Optionals

Strings

Arrays, Dictionaries, and Sets

Swift Enumerations

iOS Basics

Value and Reference Types

Concurrency

File system

Swift Structures

Location Awareness

Protocols, Optionals, Properties, Key Paths

Memory Management

Statements & Expressions

Networking

Swift Parameters

HTTP

Grand Central Dispatch (GCD)

Closures

Graphics

Swift Classes and Objects

Storage

UIKit

REST

Error handling and debugging

Human Interface Guidelines

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The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.

85%

reduction in screening time

View Full Case Study

FAQs

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

Non-googleable questions
IP proctoring
Web proctoring
Webcam proctoring
Plagiarism detection
Secure browser

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.